Preparation and Luminescence Properties of SrMoO4 Doped with Pr3+

2014 ◽  
Vol 633 ◽  
pp. 253-256 ◽  
Author(s):  
Cui Lan Gan ◽  
Xiao Li Xu ◽  
Ji Hui Yang ◽  
Zi Fei Peng
Keyword(s):  
Solid State ◽  
Sintering Temperature ◽  
Light Emitting Diode ◽  
Red Light ◽  
Average Particle Size ◽  
Solid State Reaction Method ◽  
Luminescence Properties ◽  
Average Particle ◽  
Light Emitting ◽  
Transmission Electron

A red light-emitting phosphor of SrMoO4: Pr3+was synthesized by a convenient high-temperature solid-state reaction method. The structures, morphologies and optical properties of as-prepared products were characterized by X-ray diffraction (XRD), transmission electron microscope (FESEM) and photoluminescent (PL). A strong red emission centered at 645 nm corresponding to the 3P0→3F2transition of Pr3+is observed under 430–500 nm excitated. In addition, it has been found that M+(M+= Li+, Na+or K+) codoped SrMoO4: Pr3+phosphors could lead to a remarkable increase of photoluminescence. Luminous intensity was the highest when doping Na+ions. The influence of the sintering temperature on the luminescence properties of the phosphors is also discussed. The optimum sintering temperature was 900°C. The average particle size was about 2~4 μm. Thus, it is a promising material for solid-state lighting based on GaN light-emitting diode (LED).

Broadband near-infrared BaMSi3O9:Cr3+ (M = Zr, Sn, Hf) phosphors for light-emitting diode applications

2021 ◽  
Author(s):  
Yan Zhang ◽  
Yanjie Liang ◽  
Shihai Miao ◽  
Dongxun Chen ◽  
Shao Yan ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Near Infrared ◽  
Light Emitting Diode ◽  
Solid State Reaction Method ◽  
Luminescence Properties ◽  
Light Emitting ◽  
Reaction Method ◽  
Simple Solid State Reaction

A series of Cr3+-doped BaMSi3O9 (M = Zr, Sn, Hf) near-infrared emitting phosphors with tunable luminescence properties have been successfully synthesized by using a simple solid-state reaction method. The developed...

Luminescence Properties and Synthesis of SrMgAl10O17:Mn4+ Red Phosphor for White Light-Emitting Diodes

2016 ◽  
Vol 16 (4) ◽  
pp. 3489-3493 ◽  
Author(s):  
Renping Cao ◽  
Hongdong Xue ◽  
Xiaoguang Yu ◽  
Fen Xiao ◽  
Donglan Wu ◽  
...  
Keyword(s):  
Red Light ◽  
Solid State Reaction Method ◽  
Luminescence Properties ◽  
Conventional Solid State Reaction ◽  
Light Emitting ◽  
White Leds ◽  
Structure Morphology ◽  
Optimal Doping Concentration ◽  
Cie Chromaticity ◽  
White Light Emitting Diodes

A series of Mn4+ doped SrMgAl10O17 phosphors are synthesized by a conventional solid-state reaction method in air, and their crystal structure, morphology, and fluorescence properties are investigated. The luminescence properties show clearly that SrMgAl10O17:Mn4+ phosphor can be excited by UV (200–380 nm), near UV (380–420 nm), and blue (420–480 nm) bands of LEDs chip, and emits red light in the range of 600 nm to 750 nm with satisfying CIE chromaticity coordinates (0.7207, 0.2793). The optimal doping concentration of Mn4+ ion is ∼1 mol%, and its lifetime is ∼1.15 ms. The possible luminous mechanism of Mn4+ ion is discussed by Tanabe-Sugano diagram. These experiment results indicate that Mn4+ doped SrMgAl10O17 phosphors can be a potential application as a red-emitting phosphor candidate in white LEDs.

scholarly journals Synthesis and luminescent properties of novel red-emitting M7Sn(PO4)6:Eu3+(M= Sr,Ba) phosphors

2018 ◽  
Vol 12 (1) ◽  
pp. 8-12
Author(s):  
Guo Feng ◽  
Weihui Jiang ◽  
Jianmin Liu ◽  
Cong Li ◽  
Quan Zhang
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Red Light ◽  
Luminescent Properties ◽  
Solid State Reaction Method ◽  
Formula Unit ◽  
Conventional Solid State Reaction ◽  
Light Emitting ◽  
Reaction Method ◽  
Uv Leds

Novel Eu3+-activated M7Sn(PO4)6 (where M = Sr, Ba) red-emitting phosphors were synthesized via conventional solid-state reaction method at 1200 ?C for 2 h. The luminescence properties of the prepared samples and quenching concentration of Sr7-xSn(PO4)6 :xEu3+ and Ba7-xSn(PO4)6 :xEu3+ were investigated. These phosphors can be efficiently excited by UV (395 nm) and visible blue (465 nm) light nicely matching the output wavelengths of the near-UV LEDs and InGaN blue LED chips and emit the red light. The critical concentrations of the Eu3+ activator were found to be 0.175mol and 0.21mol per formula unit for Sr7-xSn(PO4)6 :xEu3+ and Ba7-xSn(PO4)6 :xEu3+, respectively. The M7-xSn(PO4)6 :xEu3+ (M = Sr, Ba) phosphor may be a good candidate for light-emitting diodes application.

scholarly journals Growth of significantly low dimensional zinc orthotitanate (Zn2TiO4) nanoparticles by solid state reaction method

2018 ◽  
Vol 50 (1) ◽  
pp. 133-138 ◽  
Author(s):  
Lizina Khatua ◽  
Rudrashish Panda ◽  
Avanendra Singh ◽  
Arpan Nayak ◽  
Pravakar Satapathy ◽  
...  
Keyword(s):  
Particle Size ◽  
Solid State ◽  
Surface Area ◽  
Solid State Reaction ◽  
Average Particle Size ◽  
Cost Effective ◽  
Solid State Reaction Method ◽  
Average Particle ◽  
Reaction Method ◽  
Low Dimensional

In this work, the ZnO-TiO2 mixed phase nanoparticles were prepared by solid state reaction method by using ZnO and TiO2 powder as precursors. The X-ray diffraction pattern shows a dominant phase of Zinc Orthotitanate (Zn2TiO4). The average particle size (58?18 nm) calculated by the analysing FESEM data closely matches with the particle size calculated by Scherrer?s equation. The calculated average particle size is significantly smaller than the previously published results of nanoparticles, prepared by same method. In the Brunauer-Emmett-Teller (BET) study the specific surface area of the nanoparticles was found as 8.78 m2/g which is similar to the surface area reported in this material prepared by mechanochemical method. The method which we report is simpler and cost effective unlike the previous reported.

Design, Synthesis and Charaterization of Polymers Derived from Fluorene for Application in RGB Polymer Light-Emitting-Diodes

2001 ◽  
Vol 665 ◽  
Author(s):  
Serge Beaupré ◽  
Mario Leclerc ◽  
Isabelle Lévesque ◽  
Marie D'Iorio
Keyword(s):  
Solid State ◽  
Light Emission ◽  
Light Emitting Diode ◽  
Red Light ◽  
Synthetic Approach ◽  
Cyclic Voltammogram ◽  
New Approach ◽  
Light Emitting ◽  
Polymer Light Emitting Diode ◽  
Polyfluorene Derivatives

ABSTRACTIn order to obtain efficient blue, green and red light-emitters as active layers in polymer light-emitting diode (PLEDs), we report herein the design, the synthesis, and the characterization of new polyesters and copolymers derived from fluorene. We will focus on a new approach to obtain a stable, high luminance blue emitter via polyesters derived from fluorene. The versatile synthetic approach allows the easy design of a whole class of new and tunable electroactive and photoactive aromatic polyesters. Poly(1,6-hexane- 9,9′,9′,9′′,9′′-hexahexyl-7,2′;7′,2′′-terfluorene-2,7′′-dicarboxylate) (PTFHHC6) and Poly(1,6-hexane-2,7-Bis(1,1′-biphenylen-4-yl-4′-dicarboxylate)-9,9-dioctylfluorene) (PE-BP-DOF-BP) exhibit strong emission in the blue range, both in solution and in the solid state. Moreover, these polyesters present some advantages over other polyfluorene derivatives. For example, their solid-state fluorescence spectrum does not show the formation of any excimer and does not vary upon thermal treatment. We will also present copolymers derived from fluorene which emit green light and a new approach to obtain red polymer light-emitting-diode will also be shown. Optical properties such as light absorption, light emission and quantum yield of fluorescence in solution as well as electrical properties such as cyclic voltammogram and conductivity in-situ are reported. Finally, some of the polymers presented have been tested in PLEDs devices and the preliminary results seem promising for the development of multicoloured displays made from the same class of polyfluorene derivatives.

Influences of Firing Temperatures on Phase and Morphology Evolution of (Ba0.25Sr0.75)(Zr0.75Ti0.25)O3 Ceramics Synthesized via Solid-State Reaction Method

2009 ◽  
Vol 421-422 ◽  
pp. 247-250 ◽  
Author(s):  
Atthakorn Thongtha ◽  
Kritsana Angsukased ◽  
Theerachai Bongkarn
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Perovskite Phase ◽  
Average Particle Size ◽  
Solid State Reaction Method ◽  
Lattice Parameter ◽  
Average Particle ◽  
Strontium Zirconate ◽  
Reaction Method ◽  
Average Grain Size

The effect of calcination (1000-1400 oC) and sintering temperatures (1400-1600 oC) on the phase formation and microstructure of barium strontium zirconate titanate [(Ba0.25Sr0.75)(Zr0.75Ti0.25)O3; BSZT] ceramics were investigated. BSZT powders were prepared by the solid-state reaction method. Higher calcination temperatures increased the percentage of the perovskite phase, but decreased the lattice parameter a of BSZT powders. The pure perovskite phase of BSZT powders was detected above the calcination temperature of 1350 oC. The microstructure of BSZT powders exhibited an almost-spherical morphology and had a porous agglomerated form. The average particle size and the average grain size of the ceramics were increased with the increase of calcination and sintering temperatures. The highest density of the samples was 5.42 g/cm3 which was obtained from ceramic sintered at 1550 oC for 2 h.

Effect of Eu2O3 Concentration on the Properties of Red-Light-Emitting Sr1.5Ca0.5SiO4 Fluorescent Materials

NANO ◽  
2019 ◽  
Vol 14 (09) ◽  
pp. 1950110
Author(s):  
Jing Liu ◽  
Chia-Ching Wu ◽  
Cheng-Fu Yang ◽  
Lan-Sin Liou
Keyword(s):  
Solid State ◽  
White Light ◽  
Red Light ◽  
Solid State Reaction Method ◽  
Photoluminescence Spectra ◽  
Light Emitting ◽  
Reaction Method ◽  
Fluorescent Materials ◽  
Different Temperatures ◽  
White Light Emitting Diodes

Red-light-emitting phosphors based on Sr[Formula: see text]Ca[Formula: see text]SiO4 activated by trivalent europium ions (Eu[Formula: see text] were successfully synthesized using a solid-state reaction method, and their luminescence properties were investigated. The photoluminescence spectra of Sr[Formula: see text]Ca[Formula: see text]SiO4:[Formula: see text] Eu[Formula: see text] phosphors synthesized at different temperatures and times and with different Eu[Formula: see text] concentrations revealed emission peaks at 591[Formula: see text]nm, 612[Formula: see text]nm and 655[Formula: see text]nm, which can probably be attributed to the transition of Eu[Formula: see text] ions from 5D0 to 7FJ (J = 1, 2 and 3). The emission intensities of the transitions from 5D0 to 7FJ (J = 1, 2 and 3) increased as the synthesizing temperature rose for 2[Formula: see text]h. Comparison with the relevant International Commission on Illumination diagram showed that Sr[Formula: see text]Ca[Formula: see text]SiO4:[Formula: see text] Eu[Formula: see text] phosphors synthesized at different temperatures and times and with different Eu[Formula: see text] concentrations all emitted red light, with phosphors synthesized at 1300∘C and with concentrations of 1.5[Formula: see text]at.% yielding the maximum emission intensity. These results show Sr[Formula: see text]Ca[Formula: see text]SiO4:1.5% Eu[Formula: see text] to be a noteworthy red-light-emitting phosphor candidate for white light-emitting diodes (WLEDs).

Luminescence Properties of Magnesium Sodium Borate Glasses Doped Sm3+, Dy3+ and Eu3+

2020 ◽  
Vol 307 ◽  
pp. 314-320
Author(s):  
Abd Rahman Tamuri ◽  
Aryna Abdul Majid ◽  
Rosli Husin
Keyword(s):  
Light Emitting Diode ◽  
Energy Levels ◽  
Red Light ◽  
Emission Spectra ◽  
Luminescence Properties ◽  
Sodium Borate ◽  
Borate Glasses ◽  
Absorption Bands ◽  
Light Emitting ◽  
Color Displays

The luminescence properties Dy3+, Eu3+ and Sm3+ doped magnesium sodium borate glasses were investigated. The glasses samples containing the composition 30MgO-70Na2B4O7.10H2O-xRE2O3 (where RE = Dy3+, Eu3+, and Sm3+, x = 0.1, 0.5, and 1.0 mol %) are prepared by the conventional melt quenching technique. The optical properties have been evaluated using Ultraviolet-Visible Spectroscopy and Photoluminescence Spectroscopy. The X-ray Diffraction pattern was studied to confirm the amorphous nature of the prepared glass. The absorption spectra yield the most intense absorption bands and transition energy levels for Dy3+, Eu3+, and Sm3+ located at 347 nm (6H15/2 → 6P7/2), 393 nm (7F0 → 5L6), and 403 nm (6H5/2 →6P5/2) respectively. The emission spectra demonstrate the highest emission intensity centered at 463 nm (4F9/2 → 6F11/2 + 6H9/2), 612 nm (5D0 → 7FJ), and 599 nm (4G5/2 → 6H7/2) for Dy3+, Eu3+, and Sm3+ respectively. Dy3+ emits combination of blue, yellow, and red light, Eu3+ emits red light and Sm3+ emits orange to red light. The higher the content of Dy3+, Eu3+, and Sm3+, the higher the spectral or peak intensity for both absorption and emission. The findings could be useful for development of laser, light emitting diode (LED), and color displays applications. KEY WORDS: Luminescence, Borax glass, Magnesium, Dysprosium, Europium, Samarium.

scholarly journals A Promising Orange-Red Nanocrystalline Potassium Lanthanum Orthophosphate for White Light-Emitting Diodes

2014 ◽  
Vol 2014 ◽  
pp. 1-4 ◽  
Author(s):  
Palvi Gupta ◽  
A. K. Bedyal ◽  
Vinay Kumar ◽  
Y. Khajuria ◽  
O. M. Ntwaeaborwa ◽  
...  
Keyword(s):  
Average Particle Size ◽  
Combustion Method ◽  
Average Particle ◽  
X Ray Diffraction ◽  
Xrd Pattern ◽  
Light Emitting ◽  
Transmission Electron ◽  
White Light Emitting Diodes ◽  
Uv Excitation ◽  
The Eu

The spectral properties of the K3La(PO4)2:Eu3+ nanophosphors synthesized by the combustion method are reported. The phosphors were characterized by X-ray diffraction, transmission electron microscopy, and optical spectroscopy. The XRD pattern reveals a pure monoclinic phase of the K3La(PO4)2 with the average particle size of 30 nm in diameter. Under UV excitation, the phosphors exhibited several emission bands which were assigned to 4f-4f transitions of Eu3+ ions. The red shade of the Eu3+ ion with the CIE coordinates (x, y) as (0.63, 0.37) suggests that this material is a promising phosphor for near-UV InGaN-based LED lighting.

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